DE2454973A1 - METHOD AND DEVICE FOR TEMPERATURE CONDITIONING OF PARTS - Google Patents

Description

DR. BERG DIPL.-ING. STAPF DIPL. ^ ING. SCHWABE DR. DR. SANDMAIR

PATENT LAWYERS

8 MUNICH 86, -POSTFACH 86 02 45 245497

Attorney file 2 5 555 ■ \ -. 20, NOV · 1974

MONSANTO COMPANY
St. Louis, Missouri 63166 / USA

Method and device for temperature conditioning parts

The invention relates to a method and to a Device for the temperature conditioning of workpieces, in particular elongated parts made of thermoplastic material Material that is then to be shaped into molecularly oriented hollow bodies, such as containers.

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β (089) 988272 8 Munich 80, Mauerkircherstraße 45 Banks: Bayensche Vereinsbank Munich 453100

987043 Telegrams: BERGSTAPFPATENT Munich Hypo-Bank Munich 3892623

983310 TELEX: 0524560 BERG d Postscheck Munich 65343-808

U.S. Patent No. 3,754,851 describes a method of blowing of objects from preforms which are conditioned in an intermediate process step, i.e. brought to a temperature suitable for molecular alignment. In this procedure, the Conditioning removes heat from the preforms, which is why the process is referred to as the "cooling process" will. In other known processes, the preforms Heat is applied to them prior to final deformation to those appropriate for molecular alignment Bring temperature. One such process known as "post-heating" is, among others. in U.S. Patent 3,715,109 described. When using one of these methods in a fast and high-performance production plant it is desirable to optimize the temperature conditioning of the preforms, in order to keep the costs related to this part of the manufacturing process as low as possible. Accordingly it seems appropriate to handle large numbers of parts at the same time, relocating and moving the To simplify deformable parts during conditioning or to limit them to a minimum, the conditioning process to different inlet temperatures to be able to adjust and each part as evenly and completely as possible to the heat-transferring devices suspend in order to shorten the treatment time and to simplify the structure of the device used.

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Although the introductory, well-known Cooling and reheating procedures have useful results when used for temperature conditioning however, they have considerable deficiencies in a production plant that operates quickly and with high output on.

In the case of cooling processes, those mentioned in US Pat. No. 3,754,851 Art, for example, found that a non-uniform melt with more fluid during extrusion and differences that are less fluid do not disappear in the wall thickness of the preforms in the final shaping, so that they too are still present in the finished product. Such differences in wall thickness impair usability of the finished object, especially if it is a container, such as a hash for a pressurized content. The differences in wall thickness running in the circumferential direction occur especially in the case of preforms blown from extruded material, but less so in the case of preforms produced by injection molding on and should be balanced somehow, 'especially if the blown preforms to pressure, containers are to be further processed.

The invention provides improved methods and apparatus for temperature conditioning in particular of those workpieces that are molecularly oriented Objects to be blown, and thus eliminated

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the aforementioned deficiencies in known processes and fixtures.

In a known method for conditioning workpieces, these are in an unchangeable Position relative to each other and in relation to the direction of movement through a with heat exchanger devices equipped chamber and, after conditioning, discharged from the chamber in an even sequence. In contrast, the method according to the invention Residence time of the preforms in the chamber and thus the duration during which they are exposed to the action of the heat exchanger devices are exposed, variable, while the temperature of the heat exchanger devices, the position of the preforms relative to one another and the discharge speed essentially constant being held.

In one embodiment of the method according to the invention, numbers of elongated shapes are made at a feed station inserted side by side in brackets supplied one after the other to this station and by means of the brackets in a direction along a row of substantially parallel to each other between adjacent ones Transported heat exchanger bodies running conveyor paths and thereby around their vertical axes set in rotation, with heat exchange taking place between the moldings and the heat exchange bodies, whereupon the briquettes after their passage along the

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Conveying paths taken from the brackets by gravity and the empty holders are returned to the loading station for receiving further moldings.

I ^{1 For} the production of containers made of molecularly oriented, thermoplastic material by deforming a preform made of such a material with wall thicknesses that can be changed in the circumferential direction and with different temperatures above those suitable for the molecular alignment, the preform is passed through a conditioning zone in order to keep the temperature in the relevant areas to the appropriate value to achieve the molecular alignment, and then expanded and blown into a container, wherein according to the invention the setting of a uniform temperature of the entire preform is avoided as it passes through the conditioning zone, so that when expanding and blowing the Preform temperature differences exist between thick-walled and thin-walled areas ^.

The device according to the invention has in mutual Transverse distance running in the longitudinal direction of a chamber Heat exchanger body, which limit the specified conveying paths, and also a number of rod-shaped Holders for the simultaneous inclusion of several workpieces in a vertical position, facilities for Moving the supports along the conveying paths through the chamber, and with the moving means

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and means cooperating with the supports for rotating the workpieces about their own axes. Respectively Such a holder has a housing with a series of openings formed at a mutual transverse spacing in each of which a device for holding and rotating a workpiece sits. In a preferred Execution, the rotary drive of the workpieces takes place via a bracket running along the respective bracket Shaft with spaced-apart screws which are in engagement with the parts holding the workpieces, and with chain wheels seated at both ends, which mesh with the movement drive are located.

A controlled discharge device guides the holders in chronological order to the discharge end of the chamber, and an entry device enables the holders to enter the chamber at regular intervals. Will the preforms in a device connected on the discharge side to form molecularly oriented containers shaped, the drive of the discharge device is preferably carried out directly from the device mentioned synohron with the movement of under the discharge end of the Chamber arranged collecting funnels for receiving the preforms released from the holders.

In a preferred embodiment of the invention comprises an apparatus for temperature conditioning workpieces a series of rod-shaped brackets for the reception

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in each case a number of juxtaposed, elongated formations, a heat exchanger arrangement with mutually transverse spacing in the longitudinal direction of a chamber walls, a movement drive for Transporting the moldings inserted into the holders between the walls along through the chamber, and in operative relation to the movement drive and means arranged in relation to the holders for rotating the moldings. The ones equipped with the formations Holders are used by a feeding device in uniform Introduced into the chamber at intervals during the access of the brackets to the discharge end of the chamber is controlled by discharge devices driven by a subsequent device. The temperature-conditioned Briquettes fall out of the holders under the control of a locking device that can be moved back and forth out and get into a collection facility. In a method according to the invention it is provided that the Treatment time of the briquettes by changing the number present in each chamber of a certain length of holders can be varied, and that at a.m for the shaping of a molecularly oriented object Preform temperature differences between thicker and thinner wall areas running in the circumferential direction are maintained to account for the differences in wall thickness in final molding of the article to be able to compensate.

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In the following, exemplary embodiments of the invention are described with reference to the drawing. Show it:

HIg. 1 is a schematic longitudinal section view of a temperature conditioning device according to the invention,

Figure 2 is a view of the discharge end of the device in section along the line 2-2 in Fig. 1,

3 shows a partially sectioned plan view of a holder having a rotary drive in the direction of arrows 3-3 in Fig. 2,

FIG. 4 shows a partially sectioned view of the holder in the direction of the arrows 4-4 in FIG.

Fig. 5 is a partial view in section along the line 5-5 in Fig. 3,

6 shows an enlarged sectional view of part of a guide device of the device according to FIG. 1,

FIG. 7 shows a partially rotated 90 ° with respect to FIG. 2 sectional view of parts at the discharge end of the device shown in FIG. 1,

Fig. 8 is a plan view of the arrangement according to Fig. 7 *

9 shows a view corresponding to FIG. 2 of the entry end of the device in section along the line 9-9 in Fig. 1,

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Pig. 10 is a partial view in the direction of arrows 10-10 in ed. 2 and

S ¹ Ig. 11 is a schematic sectional view of a molding device connected to the discharge side of the device according to FIG. 1.

In Fig. 1, an apparatus 10 for temperature conditioning of moldings is shown. The device 10 has vertical side walls 12a, 12b formed approximately from sheet metal and an upper wall 14 which can be divided into a number of removable covers 18 provided with handles 16. Horizontal cross members arranged between the side walls 12a and 12b carry heat exchanger devices 21 attached to them, which abut one another in the longitudinal direction and together form a horizontally extending heat exchange zone or chamber 22. 1 shows three such heat exchanger devices 21. They each have a continuous base 24 which divides the chamber 22 into an upper part 26 and a lower part 28 which is open at the bottom over its entire length. To prevent heat loss to the environment, insulation can be provided (Fig. M-). The chamber has an entry end 30 with a feed station arranged there and a discharge end 32 opposite the latter.

The heat exchanger devices 21 each contain a number of mutually transverse spacing in longitudinal

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direction of the chamber 22 extending, upright walls 38. The walls 38 are on the relevant Parts of the bottom 24 attached and each contain serpentine channels 40 with protruding below Pipe sockets 42, 44 which via shut-off devices with a source for a heat exchange fluid used are connected. The fluid is pressurized through channels 40 circulated to control the temperature of the air between adjacent walls 38. The one another adjacent walls 38 each delimit a narrow, substantially parallel-walled conveying path 39 for the briquettes to be conditioned, the width of which is preferably is only slightly larger than that of the parts of the moldings to be conditioned. In the embodiment shown, ten such conveying paths 39 are present.

A number of elongated, rod-shaped supports carries the elongated moldings to be treated 50 in vertical hanging position between the walls. Inside the chamber 22 are the brackets immediately above the walls 38 and are along an endless path from the entry side 30 to the discharge end 32 and back again. Any bracket has a flat, elongated housing 54 of rectangular Shape, with a number of horizontally spaced openings 52 formed therein, in each of which one Device 51 for holding and rotating a molded article sits. Within the chamber 22, the holding and twisting

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devices 51 vertically over one conveying path arranged. Because of the shape of the molded articles 50 to be treated, the mountings 48 are above the chamber 22 of the walls 38 arranged. The brackets however, it can also be passed underneath the heat exchanger devices. The holding and rotating devices 51 each contain a holding part 56 with a constriction 58 formed near the lower end which is a near the open end 62 of a molding 50 formed collar 60 attaches (Fig. 4). The holding part 56 is, for example, by means of a pin with an annular worm wheel 64 that engages in a vertical slot connected, which is stored in the relevant opening 52 is. The holder 48 shown has a braking device 66 acting on a shaft 74 a brake shoe 68, which by a compression spring in contact with a sleeve pushed onto the shaft 74- 72 is charged. The mode of operation of this arrangement is explained in detail below. The brake shoe The load held in contact with the sleeve 72 is screwed into a bore 71 containing the spring 70 by means of a bore Adjustment screw 73 adjustable. The housing 54, the worm wheel 64 and the holding part 56 can from any material, but preferably made of a solid material of low thermal conductivity such as a fiber-reinforced phenolic resin.

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A drive shown in FIGS. 1 and 3 for moving of the individual brackets 48 through the chamber 22 faces a pair on either side of the chamber 22 in the longitudinal direction extending endless chains 80, which at the entry end 30 and at the discharge end 32 of the chamber 22 are each guided via a sprocket 82 and 83, respectively. The chains 80 each have two rows 85 and 87 of Break down. Likewise, the chain wheels 82 and 83 are preferably designed twice, but each outer disk has no teeth so as not to allow the passage of sprockets 132 to be described below to hinder. It is true that single chain wheels 82 and 83 would also suffice, the double version with an toothless outer disk, however, offers the advantage of a firm support of the ends of the teeth on the sprockets 132 on the non-toothed disc when changing the individual brackets 48 between the upper and the bottom at the respective ends of the chamber 22. The sprocket pairs 82 and 83 are conventional Wedged on drive shafts 84 and 89, respectively, which are rotatably mounted on side walls 12a and 12b. The tension of the chains 80 is maintained by known tensioning devices. The shaft 84 is drive-transmitting connected to a drive source such as a variable speed motor 270 (Fig. 9) · An additional brake disks 96 can be attached to the sprockets 83 at the exit end of the upper chamber, which when changing over the individual brackets 48

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from the upper part 26 to the lower part 28 of the chamber 22 by means of brake shoes 100 on the underside 102 on both Attack the ends of the brackets 48.

Attached to each other on the side walls 12a and 12b Rails 86 form a pair of endless guides 88 on either side of the chamber 22. The rails 86 have in-r sections 91 into which cell wheels 135 * 140, described in more detail below, protrude. Each bracket 48 has a retaining block 92 at each end an outwardly in the direction of the guide in question protruding pin 90 and one seated on this Roller 94, which supports the relevant holder 48 as it moves along the upper and lower parts 26 or 28 of the chamber 22 in the guides 88 leads. The guides 88 support the brackets 48 as they move along the chamber 22 in the vertical direction and thus keep the sprockets 132 in engagement with the links the unsupported, continuously driven chains 80. The guides 88 are-arranged at such a height that the chains 80 along the upper part 26 of the chamber 22 below and along the lower part 28 of the chamber extend above the chain wheels 132. As a result, the adding and removing of Brackets 48 in and out of the circuit facilitated.

As can be seen in FIG. 6, on both sides of the chamber there is in each case a section 110 of the lower one Part of the guide 88 on the underside limiting rail

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86 releasably fastened, for example, at a point designated 108 in FIG. 1. In the example shown, the section is 110 by means of a screw 112 and a pivot pin 113 on the adjoining parts 114 and 115, respectively the rail 86 attached. As a result of this arrangement, the guide 88 can be positioned at the point indicated by 108 Open to insert brackets 48 into the circuit or to be taken from it. The one after solving the part 110 resulting opening 117 is preferably only a few hundredths of a millimeter wider than the distance between the outer sides of the two rollers 94 of a holder 48 facing away from one another, so that these only in more detail Alignment to the chains 80 used, so can not be tilted. The insertion and removal of Brackets 48 in and out of the guide 88 can also take place at other locations, for example on the Entry end 30 of the chamber at which the mounts 48 with pins 146 protruding over rollers 94 can be used in opposing recesses 210 of a pair of cellular wheels 204, 206.

During their movement along the conveying paths 39, the briquettes 50 are in total with one in FIG. 3 120 designated drive in rotation about its vertical axes. The respective drive 120 is in operative connection with the outer links 87 of the respective Chain 80 and the associated bracket 48. The rotary drive 120 includes the shaft 74, which is driven by the rear end of the bracket in question across

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runs and at certain intervals a number of
Carries worms 128 which are in engagement with the teeth 130 of the individual worm gears 64 in the holder 48. The augers can be formed integrally with the shaft 74 or manufactured separately and on it
be attached. The shaft 74 has on both sides an extension 83 attached to it by means of a pin 85, on which a small chain wheel 132 is attached by means of
a pin 81 is attached. The sprockets 132 are in engagement with the outer links 87 of the chains 80 (Fig. 4). When the shaft 74 rotates, the worm wheels 64 and thus the holding parts 56 are also set in rotation by the engagement of the worms 130.

A control device, denoted overall by 134 in FIG. 7, at the discharge end 32 controls the number of im
upper part 26 of the chamber each existing brackets 48 or the changeover of successive brackets from the upper part to the lower part 26 or 28 of the chamber. The control device 134 has an upper pair of cellular wheels 135, which at the two ends of a
rotatably mounted in extensions of the side walls
Shaft 138 is attached. Furthermore, there are two lower cellular wheels 140, which are connected in a corresponding manner
a rotatably mounted shaft 141 are attached. the
upper and lower cell wheels 135 »140 have radial cells or cells formed at intervals along their circumference

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Recesses 143 and 14-5 for receiving one each the outer pegs 146 on the brackets 48 (Fig. 4). The pins 146 initially enter a pair of cells 143 of the upper cellular wheels 135 and then into a pair of cells 145 of the lower cellular wheels 140. The cellular wheels are connected to a drive I50 »(Fig. 1). In the The embodiment shown is the drive source of the drive, for example via a shaft 152 directly coupled to the drive of a molding device connected to the outlet side of the device 10. In the The shown embodiment is driven by the Shaft 152 and a. Gear 154, from which he is about Sprockets 158 are transferred to an intermediate shaft 160 will. The intermediate shaft 160 is drive-transmitting with one on the shaft 141 of the lower cellular wheels 140 seated chain wheel 164 connected. Another chain connects a pair on shafts 141 and 138 of the lower one Sprockets of the same size are seated and upper cell wheels 165ί so that the cellular wheels move at the same speed turn. The control device 134 also has an outside of the sprockets 83 between the upper ones and lower cell wheels extending, curved guide 169, which extends over the entire width of the chamber 22 extends and supports the briquettes when changing from the upper to the lower part of the chamber (Fig. 7).

Near the exit end 32 of the lower part 28 of the chamber 22 is a lock designated overall by I71

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arranged, which the release of the moldings 50 from the holders 48 when they move along the guide 88 controls between the upper and lower cell wheels. A movable assembly 156 of collecting hoppers 163 below the lock 171 catches the released moldings 50 (FIGS. 1, 8). The funnel 163 are arranged around a centrally arranged shaft 158 rotatable. The shaft 158 is in turn from the (not shown) molding device driven.

The lock 171 contains a number of one at a time Slides 164 assigned to conveying path 39, which cooperate via cylinders 256 which are selectively supplied with compressed air Move piston rods 166 in the direction of arrows 168 and can be moved backwards (Fig. 8). When a slide 164 is withdrawn to the left, the associated one falls Form 50 into a funnel just below 163. The slide 164 must be in a predetermined Bhytmus to be operated so that the in a holder in a row arranged, advancing briquettes at the right time in the circular falling funnel. This rhythm is preferred by means of electrical switches and multi-way solenoid valves arranged in the feed lines for the cylinders 256 controlled. The switches are housed in a switch box 173. When using a other than the illustrated discharge device with individual funnels 163 can also be a single, continuous Sluice gate valve, which the in

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releases a bracket seated moldings at once.

As can be seen in Fig. 2, an auxiliary drive 174- is provided for the upper and lower cell wheel pairs 135 and 140, respectively. which is electrical when the drive of the molding device is interrupted, for example in the event of a malfunction is switched on. The auxiliary drive 174- contains one conventional gear motor 176 with a sprocket 178, which transmits drive with a sprocket 180 on the intermediate shaft 160 is connected. The sprocket 180 carries part 182 of a dog clutch and is together with this on the intermediate shaft 160 freely rotatable as long as the cellular wheels via the main drive with the Gear 154- are driven. The in Fig. 10 as a whole with 185 designated dog clutch cooperates with the sprockets 158 and 180 and determines which of the the intermediate shaft 160 drives both sprockets. The coupling has a sliding mechanism that is toothed with the shaft 160 Output part 186 on which a pin 187 of a lever 188 engages. The lever 188 is articulated to a pneumatic cylinder 190 by means of a pin 189. Wind the cylinder 190 via a four-way solenoid valve 192 compressed air is supplied, the lever 188 is about its central articulation 191 to the right or pivoted to the left in FIG. As long as the subsequent molding device and the movable funnel arrangement 156 are in operation, so the shaft 152 is driven is to the cell wheels 135 and 140 via the

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To drive gear 154, there are claws 194 of the output part 186 in engagement with a drive part 187 fastened to the sprocket 158 · If, however, the movable hopper assembly 156 stopped, so is the cylinder 190 is actuated in order to move the output part 186 to the right in FIG. 2 and thus the auxiliary drive 174 to switch on. So there are now the Claws 196 on the other side of the stripping section 186 in Engage with the auxiliary drive portion 182 of the clutch. The motor 176 of the auxiliary drive is also by means of conventional Devices switched on so that the cell wheels independent of the drive of the subsequent To drive devices. If the claws of the relevant drive part and the output part of the claw coupling 185 are not exactly aligned with each other when switching over, they initially slide on each other until they come into proper alignment, whereupon they are engaged by the force exerted by the cylinder 190 to be brought. As long as the auxiliary drive 174 is in operation is, the slide 164 of the lock I7I remain through Operation of electrical locks closed, so that the moldings 50 when the brackets 48 move from the upper to the lower cell wheels 135 and 140 remain seated in the brackets and after crossing the closed lock in a near the funnel arrangement 156 under the discharge end 32 of the chamber 22, the collecting device 198 (FIG. 7), for example a chute 200, which the falling bricks of a (not shown) collecting and

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Recovery plant feeds. Due to the presence of such an auxiliary drive and a recovery system, there is an accumulation of formations in the
Device avoided in the event of an interruption in operation of the drive for the cellular wheels. As a result, the temperature-conditioned briquettes 50 can be supplied again immediately when the subsequent devices are started up again.

At the inlet end 30 of the chamber 22, a feed device 202 is provided which allows the individual holders 48 to access the feed station and from there
releases to the upper part 26 of the chamber 22 at regular time intervals (FIG. 9). The feeding device 202 has two cell wheels 204 and 206 which are rotatably mounted on the shaft 84 of the chain wheels 82 by means of bearings 203 and are mutually transversely spaced. These have forwardly inclined recesses 210 (FIG. 1) which are similar to those of the cellular wheels at the other end of the device and are arranged at intervals along the circumference. While the
Moldings in the brackets 48 are these with the
Extended pins 146 protruding on both sides are held in the recesses 210 of the cellular wheels 204 and 206. A drive, designated as a whole by 212 in FIG. 9, for rotating the cellular wheels 204 step by step
and 206 is connected to a limit switch 214 shown in Fig. 7 and has a conventional one
stepper drive 236 on. Such a stepper drive is commercially available and usually includes an arrangement

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tion of cams and gears, which the angle of rotation of the drive determined per work cycle. The output shaft 218 of the drive 216 is with a rotatable intermediate shaft 220 connected. A sprocket 222 seated at the other end of the shaft 220 drives along via a chain chain wheel 224 connected to the bucket wheel 204. So while the main drive shaft 84 is continuously driven by the motor 89 is, the cellular wheel 204 rotates independently of this stepwise on the shaft 84. For driving the Cell wheel 206 on the other side, the same with the intermediate shaft 220 cooperating arrangement is present. When moving a bracket 48 from the upper to the lower cell wheels 135 and 140, respectively On the discharge side, it comes into contact with the actuating member 226 of the switch 214 located there and switches so that the motor of the drive 216 turns on so that the output shaft 218 rotates a predetermined distance, to an empty bracket 48 from the right hand end of the lower portion 28 through the engagement of the tenons 146 in FIG to lift the recesses 210 of the cellular wheels 204, 206 to the loading station at the inlet end 30.

A part 228 of a molding apparatus shown in FIG. 11 has a pair of opposing mold halves 230a, 230b, which can be brought together in a known manner and then a cavity 232 in the form of a to be produced hollow body, such as a bottle 241. The cavity 232 may be upright or like 11, shown in Figure 11, may be placed overhead. One with

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the mold halves 230a and 230b cooperating stretching and Blower device 234 has an extendable stretching element empel 236, which has a head at the front end and by means of a movement drive into an opening is insertable at one end of the cavity. The punch 236 has a passage 237 which has lateral openings 240, over which the interior of the molding 50 Compressed air can be supplied before or after it reaches the bottom of the cavity 232 with its closed end was stretched.

When the device Ί0 is in operation, the devices that are essentially symmetrical about their axis 122 are closed End 243 and an open end 242 with a Thread and a directly below formed collar having moldings 50 supplied. The briquettes 50 are either room temperature, or they are preferably just immediately before from a preform device ejected and therefore have a higher temperature. In any case, this should be the body 244 of the moldings 50 forming thermoplastic material are brought to a temperature at which during the An essential molecular alignment occurs during stretching. This temperature is essentially in a range between the glass transition temperature of the polymer forming the thermoplastic material at the lower end and the melting temperature of the polymer at the top. Within this wide range is the molecular alignment preferably at a temperature of 16 to

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achievable above the glass transition temperature of the polymer, so that on the one hand there are no excessively large forces to reek of the polymer at the lower end of this range are necessary and, on the other hand, an excessively fast To avoid releasing the tension occurring during stretching at the upper end of the range. The device 10 can be used in particular in those cases in which the body 244 differs in temperature due to its thickness has, its temperature in the inner region, however, above that to achieve a substantial Molecular alignment is required, so that its temperature before the molding of the moldings finished item must be lowered.

The moldings 50 are at the feeding station of the entry end JO into the holding parts by machine or by hand 56 of the brackets 48 are used. For this purpose, the individual brackets 48 remain briefly on the Feed station, which is located approximately vertically above shaft 84 on cellular wheels 204, 206. As shown in Fig. 4 recognizes, the briquettes 50 sit with their collar 60 on the constriction 58 of the respective holding part 56 and form a row running along the bracket 48 perpendicular to the center line of the chamber 22. It would be also possible, the moldings 50 with the closed To feed ends 243 upwards, the arrangement shown, however, deserves the advantage, since this results in the subsequent Method steps are facilitated and the sagging of the body 244 onto the open end 242

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to be avoided at higher temperatures of the moldings.

After inserting the moldings into a holder each 48, whereby not every holding part needs to be equipped, it is made by further turning the cellular wheels 204 and 206 released so that the pins 146 are under the tension of the chains 80, with their outer links 87 the sprockets 132 are engaged, from the Recesses 210 can move out. Me bracket now moves along the front part of chamber 22, whereby between itself and its parts on the one hand and which it points towards the discharge end of the device conveying chains no relative movement takes place. So the bracket moves with the same Speed as the chains 80. There is no significant heat transfer with respect to the moldings 50 instead, so that depending on the residence time required of the moldings in the device, the heat transfer device 21 located next to the inlet end 30 omitted altogether or the supply of the heat-transferring fluid to this device initially could be blocked.

The released bracket 48 then comes under the pull of the chains 80 in contact with the rear of a previous, located in the chamber 22 holder and comes to the rear formed as a stop surface to a standstill. This is followed by a relative movement between the chains 80 and the chain wheels 132 of the rotary

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• '- 25 -

drives 120, while the bracket 48 continues from the rollers 94 in the guides 88 is held. By the engagement of the sprockets 152 with the outer links of the chains 80, the shaft 74 is set in rotation, so that the snails 128 sitting thereon are annular Worm gears 60 and the holding parts 56 non-rotatably connected therewith with the formations 50 seated therein start driving. As a result, the moldings 50 seated in the holding parts 56 now rotate relative to the they support bracket 48 about their vertical axes, while the bracket continues towards the discharge end the device is conveyed. The speed of rotation of the briquettes results from the difference between the peripheral speed of the cellular wheels, which is synchronized with the next-closing device 135 and 140, i.e. the feed speed of the holder 48, and the linear speed of the Chains 80, the latter speed having to be greater than the first in order to provide such a drive cause. So if the speed of rotation of the briquettes is to be changed during conditioning, see below all you need is the speed of the chains and / or to change the cellular wheels in order to increase or decrease the rotational speed of the bricks. Preferably only the speed of the chains is controlled by appropriate control of the drive motor 270 changed, so that the speed of the cellular wheels and thus the operating speed of the subsequent device

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can remain constant. The! Part of the feed path of the Briquettes along which they are set in rotation is usually about two thirds of the total length the chamber 22. This is where the required temperature conditioning of the moldings takes place.

If, within the framework of the overall system, there is a need for the device 10 to be inclined, i.e. running obliquely upwards set up, the exerted by the brake shoes 68 via the sleeves 72 on the shaft 74 can be Adjust the braking force by means of the adjusting screws 73 so that the shaft does not move immediately after releasing the bracket 48 "begins to rotate and the bracket opposite the chains 80 stops.

When the individual holders 48 are advanced, the bodies 244 of those seated therein move, which are set in rotation Moldings 50 along parallel conveying paths 39 between the heat exchanger walls 38. It is possible two or more briquettes side by side between a pair of further spaced apart walls through, but preferably a separate, Conveying path limited by the walls. Namely, are the conveying routes for several briquettes provided, it takes longer to move the moldings from an original temperature distribution to the Bring desired processing temperature, so that the length of the device would have to be increased to a

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to get larger heat exchange surface. Will the number If the briquettes are excessively increased per conveying path, the heat from one Formling on top of the other and only last on. transfer the walls. During the movement of the bricks through the device, its open end pieces 24-2, which no longer require any further deformation, are above of the walls 38 held in a form-fitting manner in the holding parts and therefore during the advancement of the holder protected from the effects of the walls. The atmosphere surrounding the open end pieces 242 of the moldings can have a certain cooling and hardening effect on the plastic, since it is located above the walls 38 circulate fairly freely over the open ends and the bottom of the device. At one execution of the parts of the supports 48 made of a material of low thermal conductivity, such as that mentioned above fiber reinforced phenolic resin, is a heat transfer to the open end piece 242, which is at the beginning of the Method is preferably cooler than body 244, largely avoided.

As a result of the rotation of the moldings 50 as they are fed along the conveying paths 39, the thermoplastic material becomes their body 244 to the action of the walls 38 essentially evenly exposed so that there are no end effects on the front in the direction of movement and rear sides of the briquettes can come.

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Thus, all parts of the body 244 on their way along the three independently controllable heat transfer devices 21 are exposed to the removal of heat for certain periods of time in order to adjust the temperature of the thermoplastic material to a range within which a substantial molecular alignment can be brought about by stretching. In a cooling process, heat is radiated from the moldings onto the walls and removed by means of the fluid flowing through the channels therein, such as oil or water. The fluid should nevertheless be heated to around 65 to 104 C in a cooling process in order to keep the temperature difference between the inner and outer surfaces of the body 244 as small as possible, since the optimal temperature of the material for the molecular alignment is easier with a small temperature difference can be achieved. The temperature of the fluid can be controlled by means of conventional devices in such a way that there is a temperature difference of ± 1 ^° C. between the inlets and the outlets of each group of the walls 38. In the embodiment shown, oil is supplied to each of the eleven walls 38 of a group via a distributor running parallel to their underside. The oil flows upwards in the channels 40 to a collector connecting the walls to one another, from which it is returned to the storage container. In the embodiment shown, there are three such

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Arrangements exist and each with its own facilities to regulate the temperature, so that, if necessary, an independent temperature control is possible is.

After passing through the chamber 22, the holder 48 reaches the end of the walls 38 via the cutouts 91 in. The rails 86 in the guide 88 protruding, permanently driven cell wheel pair 135? which with its recesses 143 on both sides of the Bracket protruding pin 146 engages. The ■ distance 250 of the recesses 243 along the circumference of the Cell wheels is equal to the distance between the pins 146 of two brackets 48 that lie against one another, so that the recesses come into precise engagement with the journals during the rotation of the cellular wheels 135. For the same reason the recesses of the other cellular wheels 140 and 204, 206 have the same circumferential distances. The cell wheels take the bracket by the engagement between the recesses and the pins 146 in their rotation the feed direction with until the relevant ■ recesses move upwards again and thereby the Release the pin. In order to prevent the released bracket from falling freely from the upper part 26 to the the lower part 28 of the chamber 22 is moved and the soft moldings 50 are deformed in the process, the brakes apply * Shoes 100 of the brake disks 96 on the underside 102 the bracket to hold the owls 94- in. Attachment to the outer Rails 86 to hold the guides 88 and the

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Bracket with the revolution speed of the chains 80 to convict. This has to be done carefully, but still fairly quickly to prevent the moldings from sagging to avoid.

When the holder is changed over to the lower part 28 of the chamber 22, the moldings slide along the guide 169 and are swiftly erected, partially from the relevant openings of the holder emerge until they are with the end face of their open end piece on the top of the associated slide put on. The briquettes are now briefly held upside down in the holder while they are now moving steadily backwards »(Fig. 7) ·

Since the funnel for receiving the moldings, as can be seen in FIG. 8, is continuously along a circular Move the path while the briquettes sitting in a row in the holder are moved linearly, the slide 164 must be operated in a certain rhythm so that the briquettes as precisely as possible in are released the moment its axis 122 coincides with that of a funnel 163. While Thus the holder 48 moves in the direction of the arrow 252 in FIG. 8 radially to the orbit of the funnels 163, a certain funnel is below one in a certain position at a given point in time molding sitting in the holder. The operating sequence of the slide 164 can be based on the known

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Determine the speed of movement of the holder and the funnel without difficulty, with a certain amount Sometimes two or more preforms can be released at the same time. So there is a funnel intended for the reception of a molded article resting on a specific slide under the relevant one Slide, it is automatically withdrawn by means of the cylinder-piston arrangement 256, so that the molding falls into the funnel. Because of the combination of linear and revolving movements is an exact determination of the illustrated embodiment Activation rhythm is necessary for the slide, since the funnel is all the wider in the radial direction 254 must, the further the axis of a molding at the moment the release is removed from that of the respective funnel. When the funnel is widened However, the tendency of the briquettes to tilt and then in the narrowed lower part of the Funnel 163 to get stuck.

The temperature-conditioned moldings are then converted into the in Fig. 11 is transferred to the molding device 228 shown. After closing the mold halves 230 over the molding the stretching ram 236 is inserted into the open end until its head 238 rests on the closed end End 243 comes and the body 244 in the longitudinal direction stretches to stretch the plastic to achieve longitudinal molecular alignment.

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Immediately before or after the outer surface of the closed end of the molded article with the opposite Wall of the cavity 232 comes into contact with the mold, compressed air is supplied via the mouths 240, in order to expand the molding radially outwards until it rests against the walls of the mold, and so the object to be finished while achieving radial molecular alignment. Under certain circumstances the axial and radial stretching can also take place simultaneously, for example if a pronounced ^ axial Alignment does not seem necessary.

After the moldings have been released, the individual brackets are controlled by the cellular wheel pair conveyed out of the area lying between this and the upper cell wheel pair and then through the engagement of gears 132 with chains 80 at the speed of the latter along the lower part 28 of the Chamber 22 moved to the inlet end. The control by means of the cellular wheel 140 takes place in the same way as explained above with reference to the upper cellular wheel pair 135. Preferably, there are clusters of shaped brackets between the upper and lower Avoided cellular wheel pair so that the soft, deformable briquettes do not become under their own weight sag, which could easily be the case as long as they are not held vertically. When moving backwards the holders 48 are still guided in the guides 88 by means of the rollers 94.

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As stated above, the actuated between the upper and lower cell wheel pairs at the discharge end of the device arranged switches 214 in the passage of a bracket from the upper to the lower part of the Chamber the drive 216 of the cellular wheels 204, 206, so that they are rotated further by about 180 ° to one with the Pin 14-6 seated in the recesses 210 empty holder from the lower part of the chamber to the loading station to lift, D, place more briquettes are inserted into the holder, whereupon this begins a new cycle. The holders therefore move in a closed circuit in the device 10.

The discharge of the bricks from the device is controlled by the synchronously driven cellular wheels and 140 is preferably controlled so that there is an accumulation in the treatment space in the upper part 26 of the chamber 22 249 of holders 48 fitted with moldings (FIG. 1). In the brackets shown in FIG the moldings contained therein are only partially omitted for the sake of clarity. The at certain Discharge and feed speeds taken up by the accumulation 249 of the supports 48 length of the conveying paths 39 represents the effective treatment zone in the treatment room of the chamber 22. In the same way, at the end of the lower part 28 located below the feed station a collection 250 of empty holders is present in the chamber 22. This accumulation can be achieved by introducing empty Holders at the opening shown in FIG. 6

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Guides 88 are formed or filled. For this purpose, this is done at point 108 backwards of the accumulation part of the rail 86 detachably attached by empty brackets folded down and an empty bracket inserted into the resulting opening in such a way that the rollers ° A are received in the guide 88. The bracket is then pushed by hand towards the loading station and then by the engagement of the sprockets 132 transported further with the chains 80. the The supplied bracket joins the collection of empty brackets and is finally removed from the cellular wheels lifted to the loading station. By changing the distance over which the brackets 48 of the action the heat exchanger walls 38 are exposed, and by adding or removing empty brackets the dwell time of the individual holders equipped with shapes in the treatment zone of the chamber 22 while maintaining a constant discharge speed of the moldings from the device and an im essential constant temperature of the heat exchanger-r control walls, with the briquettes both in the longitudinal as well as in the transverse direction of the chamber in unchanged Remain relative to each other. Thanks to this adaptability, business interruptions can be made for example Re-equilibrium after changing the temperature of the heat transfer fluid avoid. As long as the rhythm with which empty holders are fed from the supply 251 to the loading station

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is the same as the rhythm with which the brackets released from the accumulation 249 a stable state. For example, a change in the feed temperature of the moldings makes a corresponding change If the treatment time is changed, the Drive 216 can be controlled by means of a manually operated switching device bridging switch 214 in such a way that that the empty brackets are brought up to the loading station in faster succession and released from it will. This allows the number of holders present in the treatment zone and thus the dwell time of the holders and moldings subsequently introduced increase in the treatment zone without affecting the discharge rhythm of the treated briquettes. It may be necessary to briefly interrupt the loading of the device, for example when the above In this way, empty holders are fed to part of the chamber or when they are quickly passed through the loading station are conveyed through until a complete set of formations has accumulated. In this In this way, an interruption in the operation of the devices preceding the device 10 can be avoided. in the reverse case, that is, if the supply to the treatment room is slower than the discharge from it the length of the accumulation 249 and thus the dwell time the moldings in the treatment room are shortened, while the Collection 251 of empty holders increases.

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_ 36

In the production of the moldings 50 by blowing can these in the circumferential direction areas 253 »255 with different Maintain wall thickness (Fig. 4). Unmuttable After blow molding, there is a special temperature distribution in the moldings. One when blowing with one The outer layer or skin in contact with the cooled mold wall has a lower temperature than that further inward areas of the walls. In addition, thin-walled areas cool down more than 255 the thick-walled areas are therefore cooler than these on the whole. When forming hollow bodies with molecular Alignment and preferably uniform wall thicknesses from such preforms must be before the body Expanding or stretching are cooled, between thick-walled and thin-walled areas 253 and 255, respectively of the molding, certain temperature differences must be maintained. In the presence of such temperature differences the thin-walled, cooler area 253 expands less than the final molding thick-walled, warmer area 255 »so that the differences in wall thickness in the preform are compensated for and the finished object has a more uniform wall thickness. When temperature conditioning a molding with the distribution of areas of different wall thicknesses shown in FIG. 4 in the inventive The device will allow the development of a uniform temperature of the entire molding as it passes through the Treatment room intentionally avoided in order to

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following stretching and blow molding a temperature difference between thick-walled and thin-walled areas maintain. With a uniform temperature distribution, the thin-walled areas would have a smaller one Flow strength than the thick-walled ones, so that they stretch more and the wall thickness is even greater decreases. As a result, the usefulness of the finished object is then significantly impaired, especially if it is a container or a bottle. However, if the preform has an essentially constant wall thickness in the circumferential direction, this is maintained of temperature differences not necessary and preferably to be avoided and instead a bring about even temperature distribution.

example

A thermoplastic material in the form of a polymer of 70 wt.% Acrylonitrile and 30 wt.% Of styrene was conducted at a temperature of about 24-6 ⁰ C in the manner described in US-PS 3 754 · 85I manner by a conventional annular die into a hollow parison extruded. Parts of the extruded strand were included in a blow mold whose wall was cooled to ⁰ C 4, and molded into preforms 50 of the type shown in Fig. 4. Differences in wall thickness were found on cut shapes. After blowing, the moldings were held in the mold for a few seconds until the material at least the outer skin and usually the area immediately below it was sufficient

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_ 38 _

had solidified. The moldings were then removed and the mold burrs removed therefrom. Subsequently were the briquettes are immediately placed in holders and each is surrounded by a cylindrical jacket at a certain distance, to create an undisturbed, draft-free environment in which a temperature equilibrium is achieved without any significant Differences in areas of different thicknesses of the walls could be set. It was assumed that that the cooled outer areas slowly by conduction from the inner, warmer areas would be heated forth, while the temperature of the inner areas decreases accordingly until the wall then had a temperature that hardly changes from the inside to the outside over its entire thickness. The coats were removed from the molds at regular intervals and these were removed from theirs in front of an infrared measuring device Axis rotated. The measuring device used was a type numbered 4010S from the Williamson Corp., Concord, Mass. USA made temperature display device. The measured in this way Surface temperature rose over the course of 3.5 minutes to an average of about 141 C. This temperature is in the range in which at which Kitrile-based thermoplastic material used for the moldings has a substantial molecular orientation is achievable. Immediately after reaching this temperature, the moldings were enclosed in a mold and Bottles 241 of the type shown in Fig. 11 for the

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pack of pressurized liquids blown. The blown! "Tabs were filled with water, with Lids closed and from a height of about 45 cm dropped on a flat surface. Other similarly filled and sealed bottles were in the The space above the liquid level was subjected to a gradually increasing pressure until they burst. The for Bursting leading pressure was arrested. These attempts served as comparative experiments.

Other moldings produced in the manner described above were sent by the inventive device, the temperature of the heat transfer fluid was maintained at about 71 ⁰ C. The moldings were then immediately stretched and blown into bottles. The type of polymer, the shape and weight of the moldings and the shape of the mold were the same as in the experiment described above.

The bottles made first in this process became perpendicular in the area of their largest diameter cut through to their longitudinal axis and raessen their wall thicknesses using a micrometer. It resulted from one side to the other there are considerable differences in wall thicknesses of 50 to 60%. Then the task of empty brackets to the feeding station and thus the length of the accumulation in the treatment room full of holders reduces the dwell time of the briquettes to be treated in the treatment zone

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- '40 -

to shorten gradually. In the course of the shortening of the residence time empirically carried out in this way the thickness differences of the walls of the cut bottles decreased to values between 10 and 15% · After this reduction in the wall thickness differences to the lowest possible value, the above burst and drop tests described. These led to the following results:

Drop test burst test (burst pressure)

Comparison (uniform P

Temperature distribution) 3 from 12 * 9 * 5 to 11.2 kp / cm

Invention (uneven

Temperature distribution) 19 from 20 * 11.6 to 12.4 kp / cm

* survived the drop test 3 out of 12 or 19 out of 20 Bottles.

In the method according to the invention to achieve the smallest possible differences in wall thickness of the finished Bottles, the molded products used initially have a temperature profile at which the temperature at the Outer surface is relatively low and through the wall down to a little below the extrusion temperature value on the inner surface increases. Overall, the wall temperature is significantly higher than that required of molecular alignment beneficial. At the beginning of the cooling process, such a molding gives a such wall thickness distribution evenly from heat. The one with a lower heat capacity cools down thinner wall area more than the thicker wall area having a greater heat capacity.

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This also cools down, but remains warmer. Before this temperature distribution can change due to the excessively long action of heat extraction on the molding, the molding is stretched and blown so that a finished object with essentially uniform wall thickness can be obtained, that is, an object without excessively thin areas which, under the influence of Pressure and impact tear. Before stretching and blowing, the average temperature differences between thicker and thinner wall areas are about 3 to 11 ⁰ G.

As can be seen from the above description, the method according to the invention, in which between thicker and thinner wall areas of a molded article to be formed into a container maintain temperature differences will be superior to the known method which the walls of the molding are brought to a uniform temperature before molding.

The invention is not restricted to the above exemplary embodiments, but extends to various ones Changes and modifications to the same.

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Claims (12)

Patent claims: 1. A method for the continuous conditioning of molded parts, in which the molded parts by a Heat exchanger devices containing chamber guided and thereby with respect to the direction of movement through the Chamber held in an unchanged position relative to one another and after conditioning in a constant Khytmus are continuously discharged from the chamber, characterized in that the residence time of the molded parts in the chamber is varied while the temperature of the heat exchanger devices, the position of the molded parts relative to one another and the discharge rhythm of the molded parts are kept essentially constant. 2. The method according to claim 1, characterized in that the molded parts during their passage rotated by the chamber about their vertical axes. 3. The method according to claim 1 or 2, characterized characterized in that the molded parts are inserted side by side in holders at a loading station, while passing through the chamber in the holders rotated about their vertical axes and afterwards the passage through the chamber from the holders, and that the holders to the feed station to be led back. 509821/0798 4. Process for forming hollow bodies with molecular Alignment and improved uniformity of the wall thickness, characterized in that an axially symmetrical molding, closed at the end, is made of thermoplastic material, which at least partially has a temperature which is higher than that to achieve substantially more molecular Alignment of the material suitable, and which further in the circumferential direction areas of different thickness with temperature differences present therebetween, that the temperature of these areas is maintained the temperature difference is reduced to a value at which a substantial molecular alignment can be achieved, and that the areas are different Thickness can be stretched to different degrees up to the plant on the walls of a form, whereby the wall thickness the thicker areas is reduced more than that of the thinner areas, so that the molded body receives a more uniform wall thickness. 5. Process for the continuous molding of containers of molecularly oriented, thermoplastic material, characterized in that a number of preforms at a loading station by means of steps provided at one end thereof in FIG a linear row is used hanging in a rod-shaped holder that the holder with the therein hanging preforms in the forward direction over a Series of mutually spaced thermal 509821/0798 exchange walls Mnwegführung is so that a larger Part of the length of the individual hanging preforms between a pair of adjacent walls that during the forward movement of the bracket heat passes between the larger parts of each Preforms and the heat exchanger walls are transferred to the larger parts at a temperature at which a substantial molecular alignment can be achieved by stretching the material, that the holder containing the hanging preforms after the preforms have passed between the walls is turned through that the individual preforms after turning the holder briefly with their ends be supported in the reverse, upright position on a back and forth movable locking slide that the individual locking slides are actuated so that the preforms in question take off under their own weight fall out of the holder so that the individual released preforms are transferred to a SOrmstation, that the individual preforms are formed into a container in a blow mold, while the temperature of the larger Partly in the range suitable for achieving molecular alignment is that the brackets after Discharge of the preforms backwards under the walls in the direction of the feed station are and that the empty brackets turned individually from a position below the walls and in a Position at the loading station for receiving further preforms. 509821/0798 6. Device for the temperature conditioning of elongated standard parts, with a horizontally extending chamber delimited by walls, heat exchanger devices running at mutual distances in the longitudinal direction of the chamber, which limit essentially parallel conveying paths for the molded parts, a number of rod-shaped holders for holding the molded parts in a vertical position between the heat exchanger devices, and with devices for advancing the holders through the chamber, characterized by drive devices (120) connected to the feed devices (80) and the holders (4-8) in a motion-transmitting manner for rotating the molded parts (50) their vertical axes as they move along the conveying paths (39). 7. Apparatus according to claim 6, characterized in that the residence time of the brackets (48) supported molded parts (50) in the chamber (22) regardless of the discharge speed of the molded parts from the chamber and from the temperature of the heat exchanger devices (38) arranged therein is controllable. 8. Apparatus according to claim 7, characterized in that the dwell time of the holders (48) can be varied by increasing or decreasing the number of holders located in the chamber (22). SO 9821/0798 9. Apparatus according to claim 7 »characterized in that the dwell time of the brackets (48) by increasing or decreasing the entry speed with the temperature of the heat exchanger devices (38) and discharge speed kept essentially constant the conditioned molded parts (50) is variable. 10. Apparatus according to claim 6, characterized in that the rod-shaped holders (48) annular holding parts (56) connected to a rotary drive (120) and one connected to the rotary drive Have braking device (70). 11. The device according to claim 6, characterized in that the devices for the advance of the holders (48) opposite one another horizontally along the chamber (22) extending endless chains (80), rotatably mounted by means of shafts (84, 89) at the inlet and discharge ends (30 and 32) of the chamber (22) Sprockets (82, 83) for the chains and control devices, and that the control devices upper pair rotatably mounted at the discharge end of the upper part (26) of the chamber by means of a shaft (138) Cell wheels (135) with radial formed in its circumference Recesses (143), a lower pair rotatably mounted at the discharge end of the lower part (28) of the chamber Cell wheels (40) with radial recesses (145) formed in their circumference, one outside the chain wheels S09821 / 0798 running between the upper and lower part of the chamber, arcuate guide (169) extending transversely across the chamber for the mold parts (50) and devices (150) for the synchronous drive of the cell wheels have, and that at the ends of each bracket (48) protrudes a pin (146) on which the upper and lower cell wheels attack one after the other with their recesses. 12. The device according to claim 11, characterized in that the control devices have a rotary drive (150) for a pair of cellular wheels (135, 14-0) and one that can be connected in a drive-transmitting manner to the rotary drive for the cellular wheels and to an auxiliary drive (174) Have clutch assembly (185). 13 · Device for temperature conditioning of elongated molded parts, with a horizontally running, walls delimiting an inlet end and a discharge end with a chamber with a chamber into an upper and a lower part dividing floor, with a number of mutually spaced in the longitudinal direction the chamber extending heat exchanger walls, which are substantially parallel to each other Limit running conveying paths for the molded parts, and with devices for passing a heat transferring Fluid through the walls, characterized by a number of above the heat exchanger walls (38) along the chamber 609821/0798 mer movable brackets (4-8), each with a housing (54-), which has a number of horizontal Has openings (51) formed therein and oriented perpendicularly to the individual conveying paths (39), in each of which an annular worm wheel connected to a holding part (56) for a molded part (50) (64 ·) is mounted, by means for advancing the mounts through the chamber, with a pair along opposite sides of the chamber (22) extending horizontally through the chamber, double-row Chains (80) and a pair of double sprockets (82, 83) for the chains on opposite sides Ends of the chamber, through a rotary drive for the worm wheels, each with one along one Bracket extending shaft (74-), seated on the shaft and with the annular worm gears in engagement located worms. (128) and with seated chain wheels (132) at opposite ends of the shaft, which are in engagement with a row of links (87) of the double-row chains, by one another guides (86, 88) running opposite along the walls (12a, 12b) on both sides of the chamber by projecting formations (94-) at opposite ends of each support housing for support and guiding the individual holders in the guides as they move through the chamber Control devices for enabling access of successive brackets to the discharge end of the chamber, S0982 1/0798 with upper and lower cell lines (135 »140) with radial recesses' (143, 145) for engagement with over the shafts of the brackets at both ends of the same protruding pins (146) and with a Rotary drive (150) for the cellular wheels, through an arrangement of movable collecting funnels (163) for the molded parts below the discharge end of the chamber, through one between the lower cell wheel and the movable ones Catching funnels arranged sluice (171) for releasing the discharge of the molded parts from the holders an entry control device for releasing the access of the individual holders to the upper part (26) of the chamber at regular time intervals, with a pair of cell wheels rotatably mounted at the inlet end of the chamber (204, 206), which are distributed at intervals along the circumference, forward directed, radial recesses for the pins of the brackets, and with a drive (212) for intermittent further rotation of the cellular wheels, by an auxiliary drive (174) to continue rotating the cellular wheels when the movable funnel arrangement, and by a first of the movable funnel arrangement below the discharge end arranged collecting device for molded parts. 509S21 / 0798 Blank page